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bq30z55 PTC function

Beginner
Intellectual 2381 points
Other Parts Discussed in Thread: BQ30Z55

Hi Team,

I am writing to help on PTC question. Customers is using bq30z55 solution. Basically,they don't want to use this pin.Thus, the pin is tie to GND directly.

However, PTC PF is triggered when high discharge current testing. The fail-rate is just a few. But we still would like to look forward your advise that any way to

disable PTC PF or any way to avoid the wrong behavior?

Something we have confirmed:

1. FW is the same with golded image,

2. the trace that PTC tie to GND is very short.

  • 0
    TI__Guru 73830 points
    The PTC function cannot be disabled with firmware. Tying the pin to GND or to GND through a 10k resistor are the only ways to disable it. Maybe the high discharge currents are causing ground bounce or injection and inducing the fault. They can try using a 10k resistor.